Past Talks and Events

MIP 2019, member of the poster prize committee.
INFORMS Computing Society Conference, Jan 6-8, 2019, Knoxville, TN, plenary speaker

IMA year on Open Source Tools for Operations Research, 2018–2019, co-organizer
- Opening workshop: COIN fORgery: Developing Open Source Tools for Operations Research, October 15–19, 2018, co-organizer

ICERM workshop on Core computational methods (part of the Nonlinear Algebra program), Sep 17–21, 2018, invited speaker

Oberwolfach workshop on New Directions in Stochastic Optimisation, August 19–25, 2018, invited speaker
ISMP 2018.
Optimization and Discrete Geometry: Theory and Practice, 24-27 April, 2018 Tel Aviv University, Israel. Invited speaker
ISCO 2018.
Bridging Continuous and Discrete Optimization, Aug. 16 – Dec. 15, 2017, Simons Institute for the Theory of Computing, Berkeley. Invited Core Participant.
INFORMS Annual Meeting, Oct. 22–25, 2017, Houston, Texas.
August 2017: Sage Days: Opening Workshop for a Year of Coding Sprints, IMA, Minneapolis, August 21–25, 2017. Organizer. (Part of the 2017–2018 IMA program SageMath Coding Sprints.)
August 2017: SIAM Conference on Applied Algebraic Geometry, July 31–Aug. 4, 2017, Georgia Tech. Invited minisymposium speaker (Algebraic and Geometric Methods in Discrete Optimization).
2017 Mixed Integer Programming Workshop, June 19–22, 2017, HEC Montréal, Canada. Invited speaker.
- My Ph.D. student Jiawei Wang presented our joint poster: Structure and Interpretation of Dual-Feasible Functions
- My graduating Ph.D. student Yuan Zhou presented our joint poster: Two-Sided Discontinuous Cut-Generating Functions in the Gomory–Johnson Model
BayOpt 2017, dedicated to Professor Roger J-B Wets on the occasion of his 80th birthday, May 12–13, 2017, UC Davis. Invited speaker.
Polyhedral geometry and partition theory, American Institute of Mathematics, San Jose, California, Nov 7-11, 2016. Invited participant; two presentations.
Sage Day at UC Davis, October 26, 2016, one presentation.
Talk in the UC Davis Applied Mathematics seminar, Friday, Sep 30, 4:10pm: Integer optimization, cutting planes, and computer-assisted proofs
July 2016: ICMS 2016 - The 5th International Congress on Mathematical Software, Berlin
- Session Mathematical Optimization: I presented the paper:
  - Software for cut generating functions in the Gomory-Johnson model and beyond (with C. Y. Hong and Y. Zhou).
- Session Software for Mathematical Reasoning and Applications: My student Yuan Zhou presented: Parameter space analysis for algebraic Python programs in SageMath
- Session Polyhedral Methods in Geometry and Optimization: I presented Sage flavored LattE integrale (with J. A. De Loera, B. Dutra, V. Baldoni, N. Berline, M. Vergne, and previous LattE contributors).
Homological and Computational Methods in Commutative Algebra, Cortona, Italy, May 29-June 4, 2016. Invited participant.
2016 Mixed Integer Programming Workshop, Coral Gables, FL, May 23-26, 2016. My student Yuan Zhou presented our joint poster Toward computer-assisted discovery and automated proofs of cutting plane theorems (Honorable mention in the poster prize competition)
ECCO XXIX - 29th Conference of the European Chapter on Combinatorial Optimization, Budapest, Hungary, May 26-28, 2016. Contributed talk: Toward computer-assisted discovery and automated proofs of cutting plane theorems (with Yuan Zhou)
ISCO 2016 - 4th International Symposium on Combinatorial Optimization, Vietri sul Mare (Salerno), Italy, May 16-18, 2016.
- I presented the paper Toward computer-assisted discovery and automated proofs of cutting plane theorems (with Yuan Zhou), which will also appear in the proceedings.
Workshop on Integer Linear Programming in Computational Biology, Simons Institute, UC Berkeley, May 9, 2016.
Second Bay Area Optimization Meeting, UC Berkeley, April 29, 2016.
Modern Techniques in Discrete Optimization: Mathematics, Algorithms and Applications, Casa Matemática Oaxaca, November 2015
International Symposium on Mathematical Programming, Pittsburgh, July 2015
Oberwolfach workshop on Combinatorial Optimization, Nov. 9 - Nov. 15, 2014
Visit at ETH Zürich, Nov. 3 - Nov. 7, 2014
AMS Fall Sectional Meeting, San Francisco State University, AMS Special Session on Polyhedral Number Theory, Oct. 25-26, 2014
Mixed Integer Programming 2014 (Ohio State, July 21-24, 2014)
IPCO 2014 (Bonn, Germany, June 23-25, 2014)
Mixed-Integer Nonlinear Programming (MINLP) 2014 (Carnegie Mellon University, Pittsburgh, PA, June 2-5, 2014)
Bay Area Discrete Mathematics Day (Santa Clara University, April 12, 2014)
18th Combinatorial Optimization Workshop, Aussois, France, Jan. 5 - Jan. 10, 2014
IMS Program on Inverse Moment Problems at the National University of Singapore, Nov. 18, 2013 - Jan. 25, 2014
Grötschelfest 2013, Cologne, Germany, Sep. 13, 2013
Mixed Integer Programming workshop (Madison, WI, July 22-25, 2013): invited speaker
SIAM Conference on Applied Algebraic Geometry (Fort Collins, Colorado, Aug. 1-4, 2013): minisymposium speaker
IPCO 2013 (Valparaíso, Chile, March 18-20, 2013) paper: Equivariant Perturbation in Gomory and Johnson's Infinite Group Problem. II. The Unimodular Two-Dimensional Case
Talk at the Joint Math Meetings (San Diego, Jan. 12, 2013): The Gomory-Johnson infinite group problem: A 40-year update
Colloquium at Georgia Tech (Nov. 2012)
Colloquium at Santa Clara University (Nov. 2012)
ISMP 2012 (Berlin, Aug. 2012)
visit to Nanyang Technological University (Singapore, July/Aug. 2012)
Workshop on Convex Polytopes (Kyoto, July 2012)
Mixed Integer Programming 2012 at UC Davis, July 16–19, 2012
Participation in BADMath Day (San Francisco State), ISSAC 2011 (San Jose), IPCO 2011 (IBM Yorktown Heights), Mixed Integer Programming 2011 (Waterloo), Rocky Mountain Mathematics Consortium Summer School (U Wyoming), Discrete Geometry and Optimization (Fields Institute), Berkeley Optimization Day, SIAM Conf. on Applied Algebraic Geometry (NCSU, Raleigh, Oct. 2011), BAD Math Day (UC Davis)
Talks on primal integer programming at Arizona State University, March 29, 2011, and in the workshop Optimization in an Uncertain Environment, UC Davis, March 26, 2011
I participated in the program Modern Trends in Optimization and Its Application at UCLA's Institute for Pure & Applied Mathematics, Sep 13-Dec 17, 2010. I co-organized Workshop III: Discrete Optimization and gave tutorials in discrete optimization.
I participated in the Mini-Workshop: Exploiting Symmetry in Optimization, at Mathematisches Forschungsinstitut Oberwolfach, Aug 22-28, 2010
I co-organized (with Jiawang Nie) the MSRI Summer Graduate Workshop Algebraic, Geometric, and Combinatorial Methods for Optimization, August 2-13, 2010.
I co-organized Mixed Integer Programming 2010, Georgia Institute of Technology, July 26-29, 2010
Talks and sessions at SIAM Annual Meeting, Pittsburgh, July 12-17, 2010
Talk in the Optimization Seminar at U Washington, Seattle, Apr 13, 2010
Talk at Berkeley Optimization Day, March 6, 2010
Talk at Bay Area Discrete Math Day, October 17, 2009
Talk at INFORMS 2009 (San Diego)
Sep. 9, 2009, The Summation Method for Integer and Continuous Optimization, AlgebraGeometryCombinatorics Seminar at San Francisco State University, San Francisco, CA, USA.
Aug. 26, 2009, The Summation Method for Integer and Continuous Optimization, International Symposium on Mathematical Programming, Chicago, IL.
May 20, 2009, Nonlinear Optimization via Summation and Integration, iCME Linear Algebra and Optimization Seminar, Stanford University, CA, USA.
May 1, 2009, Rational generating functions and pure Nash equilibria of integer programming games (mini-talk), Bay Algorithmic Game Theory Symposium, UC Berkeley.
I co-organized the special session Advances in the Theory of Integer Linear Optimization and its Extensions (17 speakers), AMS 2009 Spring Western Section Meeting, San Francisco, CA, April 25-26, 2009
April 4, 2009, Efficient exact integration of polynomials over polytopes, AMS 2009 Spring Southeastern Section Meeting, Raleigh, NC.
Nov. 21, 2008, Nonlinear optimization via summation and integration, IMA Hot Topics Workshop: Mixed-Integer Nonlinear Optimization: Algorithmic Advances and Applications, Minneapolis, MN, USA.
Oct. 4, 2008, An Implementation of the Barvinok--Woods Integer Projection Algorithm, AMS Fall Western Section Meeting, Vancouver, BC, Canada.
Sept. 18, 2008, An Implementation of the Barvinok--Woods Integer Projection Algorithm, Minisymposium "Algebraische und geometrische Kombinatorik", Jahrestagung der Deutschen Mathematiker-Vereinigung 2008, Erlangen, Germany.
Aug. 6, 2008, An Implementation of the Barvinok--Woods Integer Projection Algorithm, Mixed Integer Programming, New York, NY, USA.
July 15, 2008, An Implementation of the Barvinok--Woods Integer Projection Algorithm, Information Theory and Statistical Learning 2008, Las Vegas, NV, USA.
March 5, 2008, Integer Linear and Non-Linear Optimization, Institut für Mathematik, TU Berlin, Germany.
Feb. 29, 2008, Integer Linear and Non-Linear Optimization, Department of Mathematics, University of California, Berkeley, CA, USA.
Feb. 7, 2008, Rational Generating Function Techniques for Integer Linear and Nonlinear Optimization, RUTCOR, Rutgers University, New Brunswick, NJ, USA.
Feb. 5, 2008, Integer Linear and Non-Linear Optimization, Department of Mathematics, University of California, Davis, CA, USA.
Jan. 29, 2008, Rational Generating Function Techniques for Integer Linear and Nonlinear Optimization, Combinatorics and Optimization Department, University of Waterloo, Canada.
Dec. 7, 2007, The Computation of Ehrhart Polynomials of Matroid Polytopes, Sächsischer Geometrietag, Magdeburg, Germany.
Nov. 17, 2007, The Computation of Ehrhart Polynomials of Matroid Polytopes, Colloquium on Combinatorics, Magdeburg, Germany.
Nov. 5, 2007, New Rational Generating Function Techniques for Integer Programming, INFORMS Annual Meeting, Seattle, WA, USA.
Nov. 2, 2007, Rational Generating Function Techniques for Integer Linear and Nonlinear Optimization, Sauder School of Business, University of British Columbia, Vancouver, BC, Canada.
Oct. 31, 2007, Minimal Generating Families of Parametric Discrete and Polyhedral Sets with Applications to Survivable Network Design, Operations Research Seminar, Simon Fraser University, Surrey, BC, Canada.
Oct. 30, 2007, Ehrhart Polynomials of Matroid Polytopes, Discrete Mathematics Seminar, Simon Fraser University, Burnaby, BC, Canada.
Oct. 27, 2007, Pareto Optima of Multicriteria Integer Linear Programs, West Coast Optimization Meeting, Kelowna, BC, Canada.
October 8, 2007, The Computation of Ehrhart Polynomials of Matroid Polytopes, Discrete Mathematics & Representation Theory seminar, University of California, Davis, CA, USA.
September 7, 2007, Computing Parametric Counting Functions using Exact Half-Open Decompositions of Polyhedra, Algebra–Geometry–Combinatorics Seminar, San Francisco State University, San Francisco, CA, USA.
July 2, 2007, Counting Lattice Points in Polytopes with a New Version of LattE ("Macchiato"), Special Algebraic Statistics Seminar, University of California, Berkeley, CA, USA.
I organized (jointly with Oktay Günlük, Andrew Miller, and Jean-Philippe P. Richard) the workshop Mixed Integer Programming 2007, Montreal, Canada
June 1, 2007, New Variants of Barvinok's Algorithm for Computing the Ehrhart Series of Rational Polytopes. Discrete Mathematics & Representation Theory seminar, University of California, Davis, CA, USA.
April 24, 2007, Integer Minkowski Programs and Network Survivability. INOC 2007 (International Network Optimization Conference), Spa, Belgium.
November 16, 2006, A Primal Variant of Barvinok's Algorithm Based on Irrational Signed Decompositions. Kolloquium über Kombinatorik, University of Magdeburg, Germany.
September 8, 2006, Fully Polynomial-Time Approximation Schemes for Mixed-Integer Polynomial Optimization in Fixed Dimension. Operations Research 2006, Karlsruhe, Germany.
July 31, 2006, FPTAS for Mixed-Integer Polynomial Optimization in Fixed Dimension. International Symposium on Mathematical Programming, Rio de Janeiro, Brazil.
June 6, 2006, Intermediate Integer Programming Representations using Value Disjunctions. MIP 2006, Miami, FL, USA.
May 31, 2006, A Primal Variant of Barvinok's Algorithm based on irrational signed decompositions. IBM T. J. Watson Research Center, Yorktown Heights, NY, USA.
May 19, 2006, Atomic Fibers, Integer Minkowski Programs, and the Design of Survivable Networks. 9th France Télécom Seminar on Optimization and Decision Aid, Nice, France.
April 21, 2006, FPTAS for Mixed-Integer Polynomial Optimization with a Fixed Number of Variables. Optimization Seminar, University of California, Davis, CA, USA.
March 24, 2006, FPTAS for Mixed-Integer Polynomial Optimization with a Fixed Number of Variables. Algebra–Geometry–Combinatorics Seminar, San Francisco State University, San Francisco, CA, USA.
January 23, 2006, FPTAS for Mixed-Integer Polynomial Optimization with a Fixed Number of Variables. ACM-SIAM Symposium on Discrete Algorithms (SODA06), Miami, FL, USA.
December 19, 2005, FPTAS for Polynomial Optimization in Fixed Dimension. Optimization seminar, TU Darmstadt, Germany.
March 16, 2005, Towards Primal-Dual Integer Programming. 9th Combinatorial Optimization Workshop, Aussois, France.
June 15, 2004, A Cut-Reformulate-Augment-Branch Algorithm for Integer Programming, Center for Operations Research and Econometrics (CORE), Université catholique de Louvain, Louvain-la-Neuve, Belgium.
November 15, 2003, Integer Programming with Group Relaxations. Colloquium on Combinatorics, Magdeburg, Germany.
September 3, 2003, Exact Primal Algorithms for General Integer and Mixed-Integer Linear Programs, OR 2003 (Symposium on Operations Research), Heidelberg, Germany.
August 21, 2003, The Integral Basis Method and extensions, International Symposium on Mathematical Programming, Copenhagen, Denmark.
March 12, 2003, The Integral Basis Method and extensions to mixed-integer programming, 7th Combinatorial Optimization Workshop, Aussois, France.
February 11, 2003, The Integral Basis Method and Extensions to Mixed-Integer Programming, Center for Operations Research and Econometrics (CORE), Université catholique de Louvain, Belgium.
June 17, 2002, Primal (Mixed) Integer Programming, "Geometric Convex Combinatorics" workshop, Oberwolfach, Germany.
May 15, 2002, A Primal All-Integer Integer Programming Algorithm Based on Irreducible Solutions, 15th Workshop on Discrete Optimization, Wittenberg, Germany.
March 15, 2001, The Integral Basis Method for Integer Programming, DONET Short Course on Primal Integer Programming at Istituto di Analisi dei Sistemi ed Informatica (IASI), Roma, Italy.
September 10, 2000, Integral Decomposition of Polyhedra and Some Applications in Mixed Integer Programming, Symposium on Operations Research 2000, TU Dresden, Germany.
May 25, 2000, Integral Decomposition of Polyhedra and Test Sets for Mixed-Integer Programs, 14th Workshop on Discrete Optimization, Holzhau, Germany.
March 15, 2000, Integral Decomposition of Polyhedra and Test Sets for Mixed-Integer Programs, Fourth Workshop on Combinatorial Optimization, Aussois, France.

Matthias Koeppe (home page)